Process for preparing bituminous emulsions



Patented Mar. 26, I 1929.

-UNITED STATES-PATENT OFFICE.

HER-MANN'PLAUSON, OF NATERS, NEAR BRIG, SWITZERLAND, ASSIGNOR '10 MINERAL I A. G. BRIG, OF BRTG, SWITZERLAND, A SWISS COMPANY.

PROCESS ROB PREPARING BITUMINOUS EMULSIONS.

No Drawing. Application filed January 12, 1827, Serial No. 160,774, and in. Italy July 31, 1926.

This invention relates to novel bituminous sidiary reactions are substantially prevented emulsions and processes for preparing them. by "presence of an excess of carbonate.

More particularly it relates to bituminous emulsions suitable for making roads such as I emulsions. of asphalt or asphaltic materials 50,60 parts by weight of asphaltic matee. g. those derived from petroleum bases, and rial sold under the registered trade mark sold under the registered trade marks Mex- S'pramex are heated to a temperature of phalte (M. P; 5157 G. combined carbon 120130 C. In a subsidiary vessel pro- 17-21%) and Spramex (M. P. 8846 C. vided with a stirrer 1 parts ofbone fat Ewdmple.

' combinedcarbon l4 l6%). Both theseprodare emulsified with 40 parts of water and ucts are almost. completely soluble in car- 2 3 parts of potassium carbonate; the mixbon bisulphide and in carbon tetrachloride. J ture is agitated till a homogenized emulsion Numerous process have been proposed for v.of bone fat is obtained which does not conpreparing such emulsions e. g. it has been t'a-in free fatty acids. The emulsion is kept proposed to mix the bituminous material" at 70-80 and the molten bitumen at a With-a saponifiable material such as a fatty" temperature of HO-130 G. is pumped thereacid and to agitate the mixture 7 with an in by means of a pitch pum and the mixaqueous solution of caustic alkali or to use ture is vigorously stirred. I omplete emulproteids or proteins in similar manner. It sification occurs producing abrown emulsion has been found that on keeping, especially of very great stability. If desired, the final when exposed to air, the stability of these product can be passed through a colloid mill emulsions is reduced, possibly through a slow or similar high speed disintegrat-or. reaction betweenthe asphaltic acids and the Sodium carbonate can be used instead of soa s. potassium carbonate. Small quantities, e. g. (lhe object of the'invention is-to provide 0.12% caustic alkali can be added without a processby which the bituminous material any disadvantage. may be readily emulsified. Further objects are to provide emulsionswhich are stab'le; thereof can be treated in the same way. emulsions which are capable of dilution with The emulsion so obtained can be diluted as water; and emulsions whose hygroscopic required by the addition of a 1-5% soluproperties are valuable for the purpose of tion of sodium or potassium carbonate while treating road surfaces. many known bitumen materialsna re coagu- The present invention comprises emulsions latedby dilution-with water.

of the bituminous material which contain- The proportions of the ingredients may alkali carbonate anda neutral glyceride. be varied in the above exampleand other In a preferred form of the invention, a fate or oils maybe employed, e. g. fish oil, substantially neutral glyceride is emulsified lard, butter, animal fat (kadaverfett), wool .withan aqueous solution of alkali carbonate fat, palm oil, etc. The best results are 010- Other bituminous materials or mixtures and this emulsion is then agitated with the tained with fats, which at -lO-14= C. possess asphalt with the aid of heat. If the fats the density of vaseline.-

, or oils contain small quantities of free fatty (It is further useful to treat the bitumen Tacids, they may befirst neutralized by a with volatile hydrocarbons or solvents, e. g. small quantity of caustic alkali,-but in any petroleum, benzine, chlorinated hydrocarcase we-add suificient carbonati sot-hat the bons, etc. since this increases the tackiness 45 emulsionconta-ins'an excess thereof. The n-drying. These may-be adiied in .small,

,emulsions soobtained are of great stability quaiitities e/g. 1 5%. -The' so ventmay be apparently because the asphalticacids; .dosadded jt the molten bitumen but is prefernot react with the oils which have beenineua ably added either; before or. after the bitutraliz'edand emulsified by carbonates, ievenllmento the fat emulsion, and emulsified p0 m presence of atmospheric oxygen. Even.,therewith.

if small quantities of soap are formed by IThe emulsions can be used for building neutralization of the oil, undesirable subroads, for making cement impermeable, for

treating walls and buildings, for application to roofs or as paints or for many other purposes.

It is preferred'to use potassium carbonate instead of sodium carbonate because the hygroscopic properties of the potassium carbonate make it valuable for applying the material to road surfaces.

I declare that what I'claim is 1. Process for making bituminous emulsions which comprises melting a bituminous substance and emulsifying same with an already prepared emulsion of a neutral glyceride in excess of alkali carbonate solution.

2. Process for making bituminous emulsions which comprises melting a bituminous substance and emulsifying same with an already prepared emulsion of a neutral glyceride; in excess of potassium carbonate solution.

'3. Process for making bituminous emulsions which comprises preparing an emulsion of a glyceride with excess of an alkali carbonate solution and caustic alkali not more than is required to neutralize the free acid contained in the glyceride, melting a bituminous com und andemulsifying same with said emulsion.

4:. Process for making bituminous emul sions which comprises melting a petroleum 6. Process of making bituminous emul-.

sions which comprises emulsifying a volatile bitumen solvent with' an emulsion of a neutral glyceride in excess of an alkali carbonate solution and thereafter emulsifying a molten bituminous compound with the mixture. i

In witness whereof, I have hereunto signed my name this 7th day of December, 1926.

HERMANN PLAUSON. 

